2020A&A...642A.129S


Query : 2020A&A...642A.129S

2020A&A...642A.129S - Astronomy and Astrophysics, volume 642A, 129-129 (2020/10-1)

Multi-waveband quasi-periodic oscillations in the light curves of blazar CTA 102 during its 2016-2017 optical outburst.

SARKAR A., KUSHWAHA P., GUPTA A.C., CHITNIS V.R. and WIITA P.J.

Abstract (from CDS):


Context. Quasi-periodic fluctuations in the light curves of blazars can provide insight into the underlying emission process. This type of flux modulation hints at periodic physical processes that result in emission. CTA 102, a flat spectrum radio quasar at a redshift of 1.032, has displayed significant activity since 2016. The multi-waveband light curve of CTA 102 shows signs of quasi-periodic oscillations during the 2016-2017 flare.
Aims. Our goal is to rigorously quantify the presence of any possible periodicity in the emitted flux during the mentioned period and to explore the possible causes that can give rise to it.
Methods. Techniques such as the Lomb-Scargle periodogram and weighted wavelet z-transform were employed to observe the power emitted at different frequencies. To quantify the significance of the dominant period, Monte-Carlo techniques were employed to consider an underlying smooth bending power-law model for the power spectrum. In addition, the light curve was modeled using an autoregressive process (AR1) to analytically obtain the significance of the dominant period. Lastly, the light curve was modeled using a generalized autoregressive integrated moving average (ARIMA) process to check whether introducing a seasonal (periodic) component results in a statistically preferable model.
Results. Highly significant, simultaneous quasi-periodic oscillations (QPOs) were observed in the γ-ray and optical fluxes of blazar CTA 102 during its highest optical activity episode in 2016-2017. The periodic flux modulation had a dominant period of ∼7.6 days and lasted for ∼8 cycles (MJD 57710-57770). All of the methods used point toward significant (>4σ) quasi-periodic modulation in both γ-ray and optical fluxes.
Conclusions. Several possible models were explored while probing the origin of the periodicity, and by extension, the 2016-2017 optical flare. The best explanation for the detected QPO appears to be a region of enhanced emission (blob), moving helically inside the jet.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: individual: CTA 102 - galaxies: active - galaxies: jets - radiation mechanisms: non-thermal - gamma rays: galaxies

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1123 2

Query : 2020A&A...642A.129S

Basic data :
4C 11.69 -- Blazar
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
Rad (2014ApJS,4C,...), QSO (2010ApJ,QSO,...), gam (2AGL,2EG,...), Bla (2009A&A,RBPL,...), X (2009A&A,1E,...), AGN (2011ApJ), * (USNO,Gaia), UV (GALEX,UVQS), MIR (WISEA,WISE), Q? (2021MNRAS), AG? (2022ApJS), G (LEDA), NIR (2MASS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
22 32 36.40890093 +11 43 50.9040592 (Radio) [ 0.0327514 0.0375 0 ] A 2020A&A...644A.159C
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
22 30 07.81126892 +11 28 22.7077456 [ 0.0327514 0.0375 0 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
077.43790775921 -38.58249241282 [ 0.0327514 0.0375 0 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-0.053 -0.044 [0.049 0.050 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 183284 [150] / z(emission) 1.03624018 [0.0005] / cz 310656.9906 [150]
   (Opt) C 2022ApJS..261....2K
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
0.0263 [0.0357] A 2020yCat.1350....0G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (6) :
B 17.75 [~] D 2010A&A...518A..10V
V 17.33 [~] D 2010A&A...518A..10V
G 15.961690 [0.055710] C 2020yCat.1350....0G
J 15.174 [0.045] C 2003yCat.2246....0C
H 14.556 [0.063] C 2003yCat.2246....0C
K 13.765 [0.052] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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Some important notes on this object about identifications and objects associations.
notes:


The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (106) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

4C 11.69 87GB 223008.3+112820 RGB J2232+117 [ATZ98] F100
2AGL J2232+1132 ICRF J223236.4+114350 RORF 2230+114 [BDW2002] q2230+1128
BWE 2230+1128 IERS B2230+114 RX J2232.5+1143 [CGL99] 24
4C -11.69 INTREF 1082 RX J2232.6+1143 [DGT2001] B2230+114
CLASS J223236.4110+114350.886 JVAS J2232+1143 1RXS J223236.8+114331 [GGR94] 2230+114
CTA 102 JVAS B2230+114 S2 2230+11 [HB93] 2230+114
Cul 2230+114 1Jy 2230+11 SQUAD DR1 J223236+114350 [IN88] 2230+114
DA 582 1Jy 2230+114 SWIFT J2232.3+1141 [LBD96] J2233+1140
1E 2230.1+1128 LEDA 2819036 SWIFT J2232.5+1141 [MGL2009] BZQ J2232+1143
2E 4622 2MASS J22323640+1143508 TGSSADR J223236.4+114350 [MML2015] 5BZQ J2232+1143
2E 2230.1+1128 MC2 2230+11.4 TIC 418977201 [P82] 2230+114
2EG J2233+1140 MITG J223236+1143 TXS 2230+114 [S77] 377
3EG J2232+1147 MRC 2230+114 USNO-A2.0 0975-20981161 [SBS92] 2230+114
EGR J2234+1127 NEWPS5 J2232+1143 UT 2230+114 [SJS95] 2230+114
0FGL J2232.4+1141 NVSS J223236+114350 UVQS J223236.41+114350.8 [VV2000] J223236.4+114351
1FGL J2232.5+1144 OHIO Y 150 VLSSr J223236.5+114347 [VV2003] J223236.4+114351
2FGL J2232.4+1143 PBC J2232.4+1144 VLSS J2232.6+1143 [VV2006] J223236.4+114351
3FGL J2232.5+1143 PCCS2 143 G077.42-38.59 VSOP J2232+1143 [VV2010] J223236.4+114351
4FGL J2232.5+1143 PKS 2230+114 WB 2230+1128 [VV96] J223236.4+114351
4FGL J2232.6+1143 PKS J2232+1143 WISEA J223236.41+114350.8 [VV98] J223236.4+114351
3FHL J2232.7+1143 PKS 2230+11 WISE J223236.40+114350.9 [WCO2009] J223235+114250
FIRST J223236.3+114350 QSO B2230+1128 WISE J223236.41+114350.8 [WTW94] 2230+114
FL8Y J2232.5+1143 QSO J2232+1143 WMAP 47 [ZEH2003] RX J2232.6+1143 2
1FLE J2231+1132 QSO B2230+114 WMAP J2232+1144 Gaia DR3 2730046556694317312
GALEX J223236.4+114351 RBPL J2232+1143 WMAP J2232+1143 Gaia DR2 2730046556694317312
GB6 B2230+1128 RFC J2232+1143 WMAP J2232+1142
GB6 J2232+1143 RGB J2232.6+1143 9Y-MST J2232+1143

References (1123 between 1850 and 2024) (Total 1123)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 13    PLX : 2    PM : 3   

   

Observing logs


ISO : 4   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : 4C 11.69

Link by name to the catalogue in VizieR :

4C 11.69 BWE 2230+1128 4C -11.69 2E 4622 3EG J2232+1147
FIRST J223236.3+114350 GALEX J223236.4+114351 IERS B2230+114 2MASS J22323640+1143508 MITG J223236+1143
NVSS J223236+114350 PKS 2230+114 PKS J2232+1143 PKS 2230+11 1RXS J223236.8+114331
USNO-A2.0 0975-20981161 VSOP J2232+1143 WISEA J223236.41+114350.8 WISE J223236.40+114350.9 WISE J223236.41+114350.8
WMAP J2232+1144 WMAP J2232+1143 WMAP J2232+1142 Gaia DR3 2730046556694317312 Gaia DR2 2730046556694317312

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